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by Cisco
Product Line: Cisco Series
Product Type: Cable
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Product Description

The QSFP-H40G-ACU5M is a Direct-Attach Twinax cable with QSFP+ Connectors designed for 40Gb Ethernet network applications, ensuring compatibility with Cisco switches and routers. It features a 5 m length, copper material for optimal signal integrity, and supports a maximum data transfer rate of 40 Gbps with a power consumption of < 0.7 W. This cable is engineered for high reliability in data centers, supporting hot-swappable installation, low latency, and is RoHS compliant, with an operating temperature range from 0°C to 70°C.

FAQs for the QSFP-H40G-ACU5M

  • What is the maximum data transfer rate of the Direct-Attach Twinax Cable?
    The maximum data transfer rate is 40 Gbps.
  • Can the cable be used for 40Gb Ethernet network applications?
    Yes, it is designed for 40Gb Ethernet network applications, including point-to-point in-rack and across-rack server or network switch connections.
  • Is hot-swap functionality supported by this cable?
    Yes, hot-swap functionality is supported.
  • What type of connectors does the cable have?
    The cable is terminated with QSFP+ connectors.
  • What are the operating and storage temperature ranges for the cable?
    The operating temperature range is 0°C to 70°C and the storage temperature range is -40°C to 80°C.
  • Does the cable comply with the RoHS directive?
    Yes, it is RoHS compliant.
  • What is the power consumption of the cable?
    Power consumption is less than 0.7 W.
  • Is the cable compatible with Cisco switches and routers?
    Yes, it is compatible with Cisco compatible switches and routers.
  • What materials are used in the cable's construction?
    The cable is made of copper with a PVC jacket material.
  • What is the significance of the cable being MSA compliant?
    MSA compliance ensures that the cable meets industry standards for interoperability and performance in multi-source agreements.

Product Review

The Cisco QSFP-H40G-ACU5M offers a direct-attach twinax cable solution designed for short-distance, high-speed 40Gb Ethernet connections, suitable for in-rack and across-rack server or network switch connections. Its compatibility with Cisco switches and routers, support for hot-swapping, and compliance with both RoHS and MSA standards ensure seamless integration and environmental safety. However, the limitation to a 5-meter length may restrict its use in larger data center configurations that require longer cable runs.


The Cisco QSFP-H40G-ACU5M is a direct-attach twinax cable designed for short-distance, high-speed data transmission applications. It is specifically engineered for 40Gb Ethernet network applications, providing an optimal solution for point-to-point in-rack and across-rack server or network switch connections. This cable is made from high-quality copper material, ensuring reliable connectivity and high performance. With a length of 5 meters, it offers flexibility for various networking setups without compromising signal integrity. This cable supports a maximum data transfer rate of 40 Gbps, making it well-suited for data centers and high-performance computing environments where high bandwidth and low latency are crucial. The QSFP-H40G-ACU5M is equipped with QSFP+ connectors on both ends, ensuring compatibility with a wide range of Cisco compatible switches and routers. The cable's design includes a PVC jacket that provides durability while maintaining flexibility for easy installation. Hot-swap capability is a notable feature of this cable, allowing for seamless integration without the need to power down network devices during installation or replacement, thus minimizing downtime. The cable is also designed to operate efficiently, with a power consumption of less than 0.7 W, which contributes to a lower overall energy cost and a reduced environmental footprint. The QSFP-H40G-ACU5M has been engineered to meet rigorous standards for quality and reliability. It is compliant with the Multi-Source Agreement (MSA), ensuring interoperability with all MSA-compliant 40Gbps rated hardware. Furthermore, its compliance with the RoHS directive makes it an environmentally friendly choice, adhering to restrictions on the use of certain hazardous substances in electrical and electronic equipment. Operating within a temperature range of 0°C to 70°C and a storage temperature range of -40°C to 80°C, this cable is tested to perform reliably in various environmental conditions. The following specifications highlight its physical attributes:
  • Impedance: 100 Ohms
  • Wire Gauge: 24 AWG
  • Weight: 370 g
The dimensions of this product, with a height of 0.5 inches and a width of 0.6 inches, make it a compact solution that does not compromise on performance. Its low latency feature ensures that data flows efficiently and without delay, which is essential for time-sensitive applications. In summary, the Cisco QSFP-H40G-ACU5M is a high-quality, high-speed networking cable designed for 40Gb Ethernet applications. Its construction from durable materials, support for high data transfer rates, and compliance with industry standards make it a reliable choice for connecting network devices. With features such as hot-swap capability and low power consumption, it offers both ease of use and efficiency, making it an essential component in modern data center and enterprise networking environments.


Model Cisco QSFP-H40G-ACU5M
Manufacturer Cisco
Cable Type Direct-Attach Copper Twinax
Length 5 meters
Conductor Material Copper
Ability to Swap While Active Supported
Outer Jacket Compound Polyvinyl Chloride (PVC)
Bandwidth Capacity 40 Gigabits per second
Impedance Level 100 Ohms
Peak Data Rate 40 Gbps
Energy Usage Less than 0.7 Watts
Operational Heat Range 0 to 70 degrees Celsius
Non-operational Heat Range -40 to 80 degrees Celsius
Shade Black
Vertical Size 0.5 inches
Horizontal Size 0.6 inches
Mass 370 grams
Cable Thickness 24 American Wire Gauge (AWG)
Usage Scenarios 40GbE connections within racks or between servers and switches
Regulatory Approval for Safety Confirmed
Compatibility Designed for Cisco switches and routers
Reach Designed for short distances
End Points QSFP+ Connectors
Signal Delay Minimal
Capacity for Hot Insertion Yes
Connector Quantity 2
Standard Conformity MSA Compliant

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